Part III: Curious Marc Repairs an All-Discrete Freq Counter: DO NOT ATTEMPT REPAIR OF CAVITY RESONATOR

I love all the “DO NOT ATTEMPT” warnings. Wow, even HP got so skittish about this stuff. Marc has a great sense of humor and notes that, “no cavity resonators were harmed in the production of this video.” I like the description of the mixers and the photo of the mixer antennas.